Shadow Rager is a trash weapon. You're better off with crystalline spider fang (10/22) in terms of ratio and backstab potential.
Faster delay applies your damage bonus more often and is part of the consideration of main hand selection for most melee classes over level 30. Rogues have to consider damage in primary, as your backstab damage scales proportionately. Rogue priorities are generally damage, ratio, and then delay. Most other dual wield melees look for a high ratio with a low delay.
Shadow Rager is a bad weapon on all accounts. Bad damage to delay ratio, extremely low backstab potential, and if you're seriously considering using one you don't even have a damage bonus to benefit from as that starts at level 31+. It's good for push, but even then that's a lv 50+ grouping tactic.
Offhand selection for a rogue is purely ratio. The higher ratio is better. The only exception is that 36% haste swiftblade since the majority of your low level damage will come from mainhand and backstabs.
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